erethism
noun
er·e·thism ˈer-ə-ˌthi-zəm 
: abnormal irritability or responsiveness to stimulation
Word History
Etymology
French éréthisme, from Greek erethismos irritation, from erethizein to irritate; akin to Greek ornynai to rouse — more at orient entry 2
First Known Use
1800, in the meaning defined above
Medical Definition
erethism
noun
er·e·thism ˈer-ə-ˌthiz-əm
: abnormal irritability or responsiveness to stimulation